refactor(push): load VAPID key from server at runtime

Dockerfile

@@ -12,10 +12,6 @@ COPY . .
 # Use a temporary DB for generation
 ENV DATABASE_URL="file:./temp.db"
 
-# Build arguments for public env vars
-ARG NEXT_PUBLIC_VAPID_PUBLIC_KEY
-ENV NEXT_PUBLIC_VAPID_PUBLIC_KEY=$NEXT_PUBLIC_VAPID_PUBLIC_KEY
-
 RUN npx prisma generate
 RUN npm run build
 

README.md

@@ -73,10 +73,8 @@ docker-compose up -d --build
 
 Mit **Docker CLI**:
 ```bash
-# Image bauen (Beachte: Public Vars müssen beim Build da sein!)
+# Image bauen
-docker build \
+docker build -t cat-sitting-planner .
-  --build-arg NEXT_PUBLIC_VAPID_PUBLIC_KEY="DEIN_PUBLIC_KEY" \
-  -t cat-sitting-planner .
 
 # Container starten
 # Container starten

app/actions/subscription.ts

@@ -43,3 +43,7 @@ export async function unsubscribeUser(endpoint: string) {
 
     return { success: true };
 }
+
+export async function getVapidPublicKey() {
+    return process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY;
+}

components/push-manager.tsx

@@ -3,7 +3,7 @@
 import { useState, useEffect } from "react"
 import { Bell, BellOff, Loader2, AlertTriangle } from "lucide-react"
 import { toast } from "sonner"
-import { subscribeUser, unsubscribeUser } from "@/app/actions/subscription"
+import { subscribeUser, unsubscribeUser, getVapidPublicKey } from "@/app/actions/subscription"
 import { Button } from "@/components/ui/button"
 
 function urlBase64ToUint8Array(base64String: string) {
@@ -31,12 +31,24 @@ export function PushSubscriptionSettings({ planId }: { planId: string }) {
     const [subscription, setSubscription] = useState<PushSubscription | null>(null)
     const [loading, setLoading] = useState(false)
     const [debugInfo, setDebugInfo] = useState<string | null>(null)
+    const [vapidKey, setVapidKey] = useState<string | null>(null)
 
     useEffect(() => {
+        async function checkSupport() {
             const checks = []
             if (!('serviceWorker' in navigator)) checks.push("No Service Worker support")
             if (!('PushManager' in window)) checks.push("No PushManager support")
-        if (!process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY) checks.push("Missing VAPID Key")
+
+            try {
+                const key = await getVapidPublicKey()
+                if (!key) {
+                    checks.push("Missing VAPID Key (Server)")
+                } else {
+                    setVapidKey(key)
+                }
+            } catch (e) {
+                checks.push("Failed to fetch VAPID Key")
+            }
 
             if (checks.length === 0) {
                 setIsSupported(true)
@@ -45,6 +57,8 @@ export function PushSubscriptionSettings({ planId }: { planId: string }) {
                 console.warn("Push not supported:", checks.join(", "))
                 setDebugInfo(checks.join(", "))
             }
+        }
+        checkSupport()
     }, [])
 
     async function registerServiceWorker() {
@@ -59,6 +73,10 @@ export function PushSubscriptionSettings({ planId }: { planId: string }) {
     }
 
     async function subscribe() {
+        if (!vapidKey) {
+            toast.error("VAPID Key missing")
+            return
+        }
         setLoading(true)
         setDebugInfo(null)
         try {
@@ -84,7 +102,7 @@ export function PushSubscriptionSettings({ planId }: { planId: string }) {
 
             const sub = await registration.pushManager.subscribe({
                 userVisibleOnly: true,
-                applicationServerKey: urlBase64ToUint8Array(process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY!)
+                applicationServerKey: urlBase64ToUint8Array(vapidKey)
             })
 
             console.log("Subscribed locally:", sub)